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/*
* Copyright Andrey Semashev 2007 - 2014.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
/*!
* \file formatter.hpp
* \author Andrey Semashev
* \date 13.07.2012
*
* The header contains a formatter function object definition.
*/
#ifndef BOOST_LOG_EXPRESSIONS_FORMATTER_HPP_INCLUDED_
#define BOOST_LOG_EXPRESSIONS_FORMATTER_HPP_INCLUDED_
#include <boost/ref.hpp>
#include <boost/move/core.hpp>
#include <boost/move/utility.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/detail/light_function.hpp>
#include <boost/log/attributes/attribute_value_set.hpp>
#include <boost/log/attributes/value_visitation.hpp>
#include <boost/log/core/record_view.hpp>
#include <boost/log/utility/formatting_ostream.hpp>
#include <boost/log/utility/functional/bind_output.hpp>
#include <boost/log/expressions/message.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace expressions {
namespace aux {
// This reference class is a workaround for a Boost.Phoenix bug: https://svn.boost.org/trac/boost/ticket/9363
// It is needed to pass output streams by non-const reference to function objects wrapped in phoenix::bind and phoenix::function.
// It's an implementation detail and will be removed when Boost.Phoenix is fixed.
template< typename StreamT >
class stream_ref :
public reference_wrapper< StreamT >
{
public:
BOOST_FORCEINLINE explicit stream_ref(StreamT& strm) : reference_wrapper< StreamT >(strm)
{
}
template< typename T >
BOOST_FORCEINLINE StreamT& operator<< (T& val) const
{
StreamT& strm = this->get();
strm << val;
return strm;
}
template< typename T >
BOOST_FORCEINLINE StreamT& operator<< (T const& val) const
{
StreamT& strm = this->get();
strm << val;
return strm;
}
};
//! Default log record message formatter
struct message_formatter
{
typedef void result_type;
message_formatter() : m_MessageName(expressions::tag::message::get_name())
{
}
template< typename StreamT >
result_type operator() (record_view const& rec, StreamT& strm) const
{
boost::log::visit< expressions::tag::message::value_type >(m_MessageName, rec, boost::log::bind_output(strm));
}
private:
const attribute_name m_MessageName;
};
} // namespace aux
} // namespace expressions
/*!
* Log record formatter function wrapper.
*/
template< typename CharT >
class basic_formatter
{
typedef basic_formatter this_type;
BOOST_COPYABLE_AND_MOVABLE(this_type)
public:
//! Result type
typedef void result_type;
//! Character type
typedef CharT char_type;
//! Output stream type
typedef basic_formatting_ostream< char_type > stream_type;
private:
//! Filter function type
typedef boost::log::aux::light_function< void (record_view const&, expressions::aux::stream_ref< stream_type >) > formatter_type;
private:
//! Formatter function
formatter_type m_Formatter;
public:
/*!
* Default constructor. Creates a formatter that only outputs log message.
*/
basic_formatter() : m_Formatter(expressions::aux::message_formatter())
{
}
/*!
* Copy constructor
*/
basic_formatter(basic_formatter const& that) : m_Formatter(that.m_Formatter)
{
}
/*!
* Move constructor. The moved-from formatter is left in an unspecified state.
*/
basic_formatter(BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT : m_Formatter(boost::move(that.m_Formatter))
{
}
/*!
* Initializing constructor. Creates a formatter which will invoke the specified function object.
*/
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template< typename FunT >
basic_formatter(FunT&& fun) : m_Formatter(boost::forward< FunT >(fun))
{
}
#elif !defined(BOOST_MSVC) || BOOST_MSVC > 1400
template< typename FunT >
basic_formatter(FunT const& fun, typename disable_if_c< move_detail::is_rv< FunT >::value, int >::type = 0) : m_Formatter(fun)
{
}
#else
// MSVC 8 blows up in unexpected ways if we use SFINAE to disable constructor instantiation
template< typename FunT >
basic_formatter(FunT const& fun) : m_Formatter(fun)
{
}
template< typename FunT >
basic_formatter(rv< FunT >& fun) : m_Formatter(fun)
{
}
template< typename FunT >
basic_formatter(rv< FunT > const& fun) : m_Formatter(static_cast< FunT const& >(fun))
{
}
basic_formatter(rv< this_type > const& that) : m_Formatter(that.m_Formatter)
{
}
#endif
/*!
* Move assignment. The moved-from formatter is left in an unspecified state.
*/
basic_formatter& operator= (BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
{
m_Formatter.swap(that.m_Formatter);
return *this;
}
/*!
* Copy assignment.
*/
basic_formatter& operator= (BOOST_COPY_ASSIGN_REF(this_type) that)
{
m_Formatter = that.m_Formatter;
return *this;
}
/*!
* Initializing assignment. Sets the specified function object to the formatter.
*/
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template< typename FunT >
basic_formatter& operator= (FunT&& fun)
{
this_type(boost::forward< FunT >(fun)).swap(*this);
return *this;
}
#else
template< typename FunT >
typename disable_if< is_same< typename remove_cv< FunT >::type, this_type >, this_type& >::type
operator= (FunT const& fun)
{
this_type(fun).swap(*this);
return *this;
}
#endif
/*!
* Formatting operator.
*
* \param rec A log record to format.
* \param strm A stream to put the formatted characters to.
*/
result_type operator() (record_view const& rec, stream_type& strm) const
{
m_Formatter(rec, expressions::aux::stream_ref< stream_type >(strm));
}
/*!
* Resets the formatter to the default. The default formatter only outputs message text.
*/
void reset()
{
m_Formatter = expressions::aux::message_formatter();
}
/*!
* Swaps two formatters
*/
void swap(basic_formatter& that) BOOST_NOEXCEPT
{
m_Formatter.swap(that.m_Formatter);
}
};
template< typename CharT >
inline void swap(basic_formatter< CharT >& left, basic_formatter< CharT >& right) BOOST_NOEXCEPT
{
left.swap(right);
}
#ifdef BOOST_LOG_USE_CHAR
typedef basic_formatter< char > formatter;
#endif
#ifdef BOOST_LOG_USE_WCHAR_T
typedef basic_formatter< wchar_t > wformatter;
#endif
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_EXPRESSIONS_FORMATTER_HPP_INCLUDED_
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